pedeick



(No Model.)

D. W. PEDRICK.

MACHINE FOR TURNING WRIST PINS.

Patented Dec. 9

INVENTOR,

lUNrriEn dramas arnnr rrrcn.

PEDRIOK 8s AYER,

OF SAME PLACE.

MACHINfi FUR TURNING WRIST PINS.

SPECIFICATION forming part of Letters Patent No. 308,925, dated December 9, 1884:.

Application filed April 24, 1884. (No model.)

To aZZ whom it may concern.-

Be it known that I, DANIEL WV. PEDRICK, of the city and county of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Apparatus for Turning WristPins, Crank-Pins, &c., of which improvements the following is a specification.

The object'of my invention, which is an improvement upon that for which Letters Patent of the United States No. 7 8,7 33 were granted and issued to Theodore A. Goff, under date of June 9, 1868, is to insure a regularand uniform longitudinal feed of the cutter, and in effecting such feed to prevent cramping or binding between the case of the cutter-ring and the guides thereof by equalizing the application of power to the former on opposite sides of its center.

The improvements claimed are hereinafter fully set forth.

In the accompanying drawings, Figure l is a View in perspective of an apparatus for turning wristpins, crank-pins, &c., embodying my invention; Fig. 2, a side view, partly in elevation and partly in section, of the same; Fig. 3, an end view in elevation as seen from the left, and Fig. i a transverse section at the line a" 00 of Fig. 2.

In the practice of my invention I construct the frame of the machine substantially as in Patent No. 78,733, before referred to, a pair of end pieces, 1 1, being located in parallel planes, and united at a proper distance apart by bolts 2 2, which serve both as connectingpicees and as guides for the cutter-case, said bolts having collars or shoulders 3 3 adjacent to their ends, against which collars the inner faces of the end pieces, 1 1, abut, and are held firmly thereto by nuts 4 4i, engaging threads on the bolts 2 2. Center screws, 5 5, having proper center-points on their inner ends, are fitted in the end pieces, 1 1, in line axially one with another, and with a cutter-ring, 6, in which the tools or cutters 7 are secured, and serve to attach the machine to the cross-head or other piece on which the wrist or crank pin to be turned is located. The cutter-ring 6 is divided diametrically into two sections,which are united in any suitable manner-as by dowel-pins Q' and is mounted, with the capacity of free rotation, in a circular opening formed in a cutter-case, 8, which is likewise formed in two sections united by bolts 10 and nuts 11, and the cutters 7 are secured by set-screws in dovetailed radial grooves in the sections. The cuttercase 8 is fitted on the guide-bolts 2 of the frame so as to be movable longitudinally thereon, and its opening, which forms the seat of the cutter-ring, is located in line axially with the center screws, 5. The-cutter ring and case are by such construction adapted to be removed from and replaced in the frame, so as to enable the cutter-ring to inclose the pin on which its cutters are to operate, such operation being effected by the rotation of the cutter-rin g and cutters While the pin and frame of the machine are stationary.

Rotation is imparted to the cutter-ring from a drivingshaft, 12, fitted in bearings in the end pieces, 1, of the frame, and carrying a crank, 13, for the application of manual power. A pulley or gear may be substituted for the crank, if desired, and the shaft rotated from any suitable prime mover. A spurgear, 14, having an internal key or feather fittinga longitudinal spline upon the driving-shaft 12, meshes with apinion,15, mountedin bearings in the cutter-case 8, which is recessed to admit the gear 14, and the pinion 15 in turn engages the teeth of a gear,16, formed upon the periphery of the cutter-ring 6. The requisite longitudinal traverse or feed of the cutter-case and cutters is imparted thereto primarily from the rotation of the driving-shaft through a pair of feed shafts, 17 1 8, which are mounted in bearings in the end pieces, 1, on opposite sides of and at equal distances from the axis of the cutterring, and are threaded between their bearings, their threads engaging corresponding female threads in the cutter-case 8. A spur-pinion, 19, on the driving-shaft through intermediate gears, presently to be described, rotates a gear, 20, fixed on the upper feed-shaft, 17, which is mounted in hearings in the end pieces of the frame, and the gear 20, through an idle-gear, 21, turning on one of the center screws, 5, rotatesa gear, 22, of corresponding diameter and pitch, secured upon the opposite feed-shaft, 18. The application of power to the cutteroase, in the longitudinal movements thereof, is thus effected equally on opposite sides of the cutterring, and an equal bearing of the case upon the guide-bolts is maintained, with a corresponding avoidance of cramping or undue friction and wear thereon. The feed-shafts 17 18 are rotated coincidently in one or the other direction, respectively, as required to move the cutter-case alternately toward each of the end pieces of the frame at the completion of its traverse in the opposite direction, according as one or the other of two pinions, 23 24, is caused to mesh with the gear 20 of the feed-shaft 17. To this end the pinions 23 24 are mounted loosely on studs upon opposite arms of a double-armed shifting-lever, 25, /which is journaled' on the end of the drivingshaft adjacent to the feed-gear 20, the pinion 23 meshing with the pinion 19 on the drivingshaft 12, and the pinion 24 with an idle-pin ion, 26, on the shifting-lever, said idle-pinion in turn meshing with the pinion 19. It will thus be seen that the pinions 23 and 24 will be rotated continuously and in opposite directions during the rotation of the driving-shaft, and by moving the shifting-lever 25 axially thereon in one or the other direction either of the pinions 23 and 24 may be engaged with the gear 20, and will impart thereto, and thence to the feed-shafts 17 1S, rotation proper to feed the cutter-case in the direction desired; or the longitudinal feed may be stopped by moving both of said pinions out of engagement with the gear 20. v

The shifting-lever may be fixed in either position by a clamping-nut, 29, engaging a thread on the end of a stud, 28, fixed in the adjacent end piece, 1, and passing through a segmental slot, 27, formed in one of the arms of the shifting-lever and curved concentrically with the driving-shaft.

I claim as my invention and desire to secure by Letters Patent- 1 1. In an apparatus for turning wrist or crank pins, the combination, substantially as set forth, of a frame, a cutter-case fitted to move longitudinally on guides therein, a cutter-ring fitting in said case, a driving-shaft which rotates said cutter-ring, and a pair of threaded feed-shafts rotated by the drivingshaft and engaging the cutter-case on opposite sides of the cutter-ring, respectively.

2. In an apparatus for turning wrist or crank pins, the combination, substantially as set forth, of a pair of end frame-pieces,-apair of guide-bolts connecting said end pieces at opposite sides, a cutter-case fitted to movelongitudinally on said guide-bolts, a cutter-ring adapted to rotate in said case, a driving-shaft which rotates said cutter-ring, a pair of feedshafts having screw-threads which engage the cutter-case on opposite sides of the cutter-rin g, respectively, and gearing for imparting coincident rotation to said feed shafts from the driving-shaft.

3. In an apparatus for turning wrist or crank pins, the combination, substantially as set forth, of a frame, a cutter-case fitted to move longitudinally on guides therein, a cut ter-ring fitting in said case, a driving-shaft which rotates said cutter-ring, athreaded feedshaft engaging said cutter case, a doublearmed shifting-lever journaled on the drivingshaft, and two driving-pinions mounted on opposite arms of said shifting-lever, and adapted to mesh alternately with a gear on the feed-' shaft, one of said pinions engaging a pinion on the driving-shaft, and the other an idlepinion, which engages said driving-shaft pin- 101i.

4. In an apparatus for turning wrist or crank pins, the combination, substantially as set forth, of a frame, a driving-shafa'a pinion fixed thereon, a feed-shaft. and a gear fixed thereon, a double-armed shifting-lever journaled on the driving-shaft, two driving-pinions mounted on opposite arms of the shiftinglever, and adapted to mesh alternately with the gear of the feed-shaft, one of said pinions engaging the drivingshaft pinion, and the other an idle-pinion meshing with said driving-shaft pinion, a stud fixed to the frame and passing through a segmental slot in the shifting'lever, and a clampin g-nut en gagingathread on said stud, and adapted to maintain the shifting-lever in position to engage either of its driving-pinions with the feed-shaft gear.

DANIEL WV. PEDBIOK.

\Vitnesses:

J. HAMoR, WM. H. GLADING. 

